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Finding the Fourth Proportional to 771.38, 1,156.74 and 405.92

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Solution

The fourth proportional to 771.38, 1,156.74 and 405.92 is: 608.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.38 : 1,156.74 = 405.92 : x
  2. Step 2: Convert to fraction form
    771.38/1,156.74 = 405.92/x
  3. Step 3: Cross multiply
    771.38x = 1,156.74 × 405.92
  4. Step 4: Simplify right side
    771.38x = 469,543.90
  5. Step 5: Solve for x
    x = 469,543.90/771.38
  6. Step 6: Final answer
    x = 608.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.